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首页> 外文期刊>Applied Magnetic Resonance >Superhyperfine structure of EPR spectra in LiLuF4 : U3+ and LiYF4 : Yb3+ single crystals
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Superhyperfine structure of EPR spectra in LiLuF4 : U3+ and LiYF4 : Yb3+ single crystals

机译：LiLuF4：U3 +和LiYF4：Yb3 +单晶中EPR光谱的超超细结构

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摘要

Electron paramagnetic resonance (EPR) spectra of doped paramagnetic crystals LiLuF4:U(3+)p and LiYF4:Yb3+ have been investigated at a frequency of about 9.42 GHz in the temperature range of 10-20 K. The U3+ ion spectrum is characterized by g-factors g (parallel to) = 1.228 and g (perpendicular to) = 2.516, and contains the hyperfine structure due to the U-235 isotope with nuclear spin I = 7/2 and natural abundance of 0.71%. The observed hyperfine interaction constants are A (parallel to) = 81 G and A (perpendicular to) = 83.8 G. Moreover, the spectrum reveals the well-resolved superhyperfine structure (SHFS) due to two groups of four fluorine ions forming the nearest surrounding of the U3+ ion. This SHFS contains up to nine components with the spacing between components being about 12.7 G. The SHFS is observed also in the EPR spectrum of the LiYF4:Yb3+ crystal; up to 17 components with spacing of about 3.7 G may be traced. Some parameters of the effective Hamiltonian of the SHF interaction are estimated, the contribution of covalent bonding of f-electrons with ligands into these parameters is discussed.
机译：掺杂的顺磁晶体LiLuF4：U（3+）p和LiYF4：Yb3 +的电子顺磁共振（EPR）光谱已在10-20 K的温度范围内，约9.42 GHz的频率下进行了研究。 g因子g（平行）= 1.228和g（垂直）= 2.516，由于U-235同位素具有核自旋I = 7/2和自然丰度为0.71％，因此包含超精细结构。观察到的超细相互作用常数为A（平行）= 81 G和A（垂直）= 83.8G。此外，该光谱还揭示了由于两个四氟离子基团形成了最近的周围环境而导致的高分辨超超精细结构（SHFS）的U3 +离子。该SHFS包含多达9个组分，组分之间的间距约为12.7G。可以追踪多达17个组件，间距约为3.7G。估计了SHF相互作用的有效哈密顿量的一些参数，并讨论了f电子与配体的共价键对这些参数的贡献。

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